Boyfriend leaving tomorrow I don't know what to do?

I know some of you guys who read this probably would get annoyed, but my boyfriend of 2 and a half years is leaving for a month tomorrow to Europe.. I'm sitting here scared of how I'd feel. I'm already aching inside. I mean sure we'll skype and call each other but the thing is I see him almost every day, I know that's not so good, but we love each others company a lot. We almost do everything together. If anyone has ever been in my situation please tell me how did you guys feel? What did you guys do to get over that heartache? Did you guys eventually get over it and feel normal again? I realized I'm too attached to him, but it's too late now I can't do anything I'm already too attached. I really don't wanna cry cuz I hate crying, though I am pretty emotional sometimes. Please don't give me a mean answer, cuz really I'm kinda upset already of him leaving.